How to Remove a Session Lock or Kill a Blocking Session
Oracle R12: How to Remove a Session Lock or Kill a Blocking Session When working with Oracle R12 , you may encounter situations where a database session blocks other users or processes. In such cases, you can identify the blocking session and terminate it if necessary. Step 1: Identify the Blocking Session Run the following SQL query to find the SID and SERIAL# of the blocking session. SELECT blocking_session, sid, serial#, event FROM v$session WHERE blocking_session IS NOT NULL; Sample Output BLOCKING_SESSION SID SERIAL# EVENT 125 240 56789 enq: TX - row lock contention Note: Record the SID and SERIAL# values from the output. These values are required to terminate the session. Step 2: Kill the Blocking Session Replace sid and serial# with the values returned by the previous query. ALTER SYSTEM KILL SESSION 'sid,serial#' IMMEDIATE; Example ALTER SYSTEM KILL SESSION '240,56789' IMMEDIATE; The IMMEDIATE option requests Oracle to terminate th...